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From wikipedia http://en.wikipedia.org/wiki/Stepper_motor

Because windings are better utilized, they are more powerful than a unipolar motor of the
same weight. This is due to the physical space occupied by the windings. A unipolar motor has twice the amount of wire in the same space, but only half used at any point in time, hence is 50% efficient (or approximately 70% of the torque output available). Though a bipolar stepper motor is more complicated to drive, the abundance of driver chips means this is much less difficult to achieve.

If you read specifications for a stepper motor that can be wired as unipolar/bipolar, you will confirm this.

But if you have a 5 wire unipolar, the central one is common to the center tap of both coils. You need to remove this connection to use it as bipolar. If you have a 6 wire, yes it is meant for that, just ignore the two other wires (some motors have connectors so you can disconnect the wires), and run it as bipolar.

stepper motor wiring http://www.esuli.it/wp-content/uploads/2011/10/stepperWiring.pngstepper motor wiring
From http://www.esuli.it/2011/10/11/converting-an-unipolar-stepper-to-bipolar/

From wikipedia http://en.wikipedia.org/wiki/Stepper_motor

Because windings are better utilized, they are more powerful than a unipolar motor of the
same weight. This is due to the physical space occupied by the windings. A unipolar motor has twice the amount of wire in the same space, but only half used at any point in time, hence is 50% efficient (or approximately 70% of the torque output available). Though a bipolar stepper motor is more complicated to drive, the abundance of driver chips means this is much less difficult to achieve.

If you read specifications for a stepper motor that can be wired as unipolar/bipolar, you will confirm this.

But if you have a 5 wire unipolar, the central one is common to the center tap of both coils. You need to remove this connection to use it as bipolar. If you have a 6 wire, yes it is meant for that, just ignore the two other wires (some motors have connectors so you can disconnect the wires), and run it as bipolar.

stepper motor wiring http://www.esuli.it/wp-content/uploads/2011/10/stepperWiring.png
From http://www.esuli.it/2011/10/11/converting-an-unipolar-stepper-to-bipolar/

From wikipedia http://en.wikipedia.org/wiki/Stepper_motor

Because windings are better utilized, they are more powerful than a unipolar motor of the
same weight. This is due to the physical space occupied by the windings. A unipolar motor has twice the amount of wire in the same space, but only half used at any point in time, hence is 50% efficient (or approximately 70% of the torque output available). Though a bipolar stepper motor is more complicated to drive, the abundance of driver chips means this is much less difficult to achieve.

If you read specifications for a stepper motor that can be wired as unipolar/bipolar, you will confirm this.

But if you have a 5 wire unipolar, the central one is common to the center tap of both coils. You need to remove this connection to use it as bipolar. If you have a 6 wire, yes it is meant for that, just ignore the two other wires (some motors have connectors so you can disconnect the wires), and run it as bipolar.

stepper motor wiring
From http://www.esuli.it/2011/10/11/converting-an-unipolar-stepper-to-bipolar/

1
source | link

From wikipedia http://en.wikipedia.org/wiki/Stepper_motor

Because windings are better utilized, they are more powerful than a unipolar motor of the
same weight. This is due to the physical space occupied by the windings. A unipolar motor has twice the amount of wire in the same space, but only half used at any point in time, hence is 50% efficient (or approximately 70% of the torque output available). Though a bipolar stepper motor is more complicated to drive, the abundance of driver chips means this is much less difficult to achieve.

If you read specifications for a stepper motor that can be wired as unipolar/bipolar, you will confirm this.

But if you have a 5 wire unipolar, the central one is common to the center tap of both coils. You need to remove this connection to use it as bipolar. If you have a 6 wire, yes it is meant for that, just ignore the two other wires (some motors have connectors so you can disconnect the wires), and run it as bipolar.

stepper motor wiring http://www.esuli.it/wp-content/uploads/2011/10/stepperWiring.png
From http://www.esuli.it/2011/10/11/converting-an-unipolar-stepper-to-bipolar/